exam Maths Puzzle Numerical Ability

The length of a rectangle is 4 feet less than the length. The area is 117 square feet. Find the length and width of the rectangle.

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SOLVE.

5/8x + 1/16x = 3/16 + x
(these are all fractions)

HELP, how do I do this? Do i have to change the 5/8 to 10/16x? Does this value describe a population parameter or a sample statistic? Explain your reasoning.
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